Construction cost control is what the contractor does about what the tracker shows. Tracking says the framing line is $2,000 over on the day the sub's contract is signed; control is the decision made that day and the rules that stop the next line doing the same. This page is the four actions that hold a budget on a small contractor's job, worked on the $449,075 build used across this site: committing before spending, pricing every change before it is built, drawing contingency by a stated rule, and buying against the estimate's lines. The construction cost tracking page on this site is the measurement; this is the control. DrawScheduleWorks Pro keeps both against the job.
Commit before you spend: the purchase order and the subcontract
Nothing is bought without a purchase order and no trade starts without a subcontract, because a cost that is committed on a document can be compared to its line before it is spent, and a cost that arrives as an invoice cannot. On the worked job the framing sub's $90,000 contract is compared to the $88,000 line on the day it is signed, and the $2,000 is decided then: covered from contingency, recovered by a change in scope, or accepted as margin. Cost control in construction projects starts with this one habit, and the federal payment clause linked below shows the same discipline on public work, where progress payments are made only against work the contract already priced.
Price every change before it is built
A change the owner asks for is priced, written as a change order that adjusts the contract sum and the affected line, and signed before the work is done, or it is work the contractor gave away. The discipline is not paperwork for its own sake: a priced change is a line the tracker can carry, and an unpriced one is an overrun that appears later with no name. On the worked job a $6,000 cabinet upgrade moves the finishes line and the contract sum together, and the draw that follows bills the changed line. The AIA pay application has a column for approved changes for exactly this reason, and the SBA's guide to managing finances, linked below, is the plain-English version of the same discipline.
Draw contingency by a rule, and say when it is gone
Contingency is a line, and it is drawn down by a written rule: which kinds of cost may take from it, who approves each draw on it, and at what balance the owner is told. On the worked job the rule sends unforeseen site conditions to contingency and owner-requested changes to change orders, and the weekly report shows the contingency balance beside the forecast. Control fails most often when contingency is treated as margin in the first month and as a surprise in the last; a rule and a visible balance are what prevent both. When the line reaches zero the report says so and the next unforeseen cost becomes a conversation, not a silent overrun.
Buy against the estimate, and read the variance every week
The estimate's quantities and rates are the buying list: lumber is bought at the estimated quantity plus the stated waste, and a purchase that exceeds the line is a question before it is an order. Each week the tracker's variance column, forecast against budget per line, is read line by line, and any line moving the wrong way gets an action written beside it. Cost control is that list of actions. DrawScheduleWorks Pro keeps the commitments, the change orders, the contingency rule and the draws as one record and shows the variance beside the pay application, so the control decisions and the money the owner pays are read from the same lines.
Questions people ask about construction cost control
What is the difference between cost tracking and cost control?
Tracking measures where each line stands: budget, committed, spent, left, forecast. Control is what the contractor does about it: commit before spending, price changes before building them, draw contingency by a rule, buy against the estimate.
How do change orders control cost?
A priced, signed change order adjusts the contract sum and the affected line before the work is done, so the tracker carries it and the draw bills it. An unpriced change is an overrun with no name that appears later.
How should contingency be managed?
As a line drawn down by a written rule: which costs may take from it, who approves, and at what balance the owner is told. Its balance sits on the weekly report beside the forecast, and when it reaches zero the report says so.